Chloromethylated polystyrene Wittig reactions

Polvstvrvlmethvlltriphenvlphosphonium Ions. The phosphonium ions used for formation of alkenes on cross-linked polystyrenes by the Wittig reaction have been prepared by reaction of triphenylphosphine with chloromethylated polystyrene in chlorobenzene at reflux (25). More highly nucleophilic phosphines such as tri- -butylphos-phine require only 80-100 °C to form phosphonium salts with chloromethylated... 

Chloromethylated polystyrene can also be converted to a phosphonium salt for use in the Wittig reaction [193] ... 

The advantages of using the phase transfer catalysed Wittig reactions to modify chloromethylated polystyrenes are as follows. 

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